[3.8] bpo-37830: Fix compilation of break and continue in finally. (GH-15320) (GH-15456)

Fix compilation of "break" and "continue" in the
"finally" block when the corresponding "try" block
contains "return" with a non-constant value.
(cherry picked from commit ef61c524ddeeb56da3858b86e349e7288d68178e)
11 files changed